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h8300: fix typo in header guard
[linux-2.6/libata-dev.git] / net / core / rtnetlink.c
bloba9a77216310e028c2dfe1d125d2706c21c51630d
1 /*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Routing netlink socket interface: protocol independent part.
7 *
8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 *
15 * Fixes:
16 * Vitaly E. Lavrov RTA_OK arithmetics was wrong.
17 */
18
19 #include <linux/errno.h>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/socket.h>
23 #include <linux/kernel.h>
24 #include <linux/timer.h>
25 #include <linux/string.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/fcntl.h>
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/capability.h>
33 #include <linux/skbuff.h>
34 #include <linux/init.h>
35 #include <linux/security.h>
36 #include <linux/mutex.h>
37 #include <linux/if_addr.h>
38 #include <linux/nsproxy.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42 #include <asm/string.h>
43
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <net/ip.h>
47 #include <net/protocol.h>
48 #include <net/arp.h>
49 #include <net/route.h>
50 #include <net/udp.h>
51 #include <net/sock.h>
52 #include <net/pkt_sched.h>
53 #include <net/fib_rules.h>
54 #include <net/rtnetlink.h>
55
56 struct rtnl_link
57 {
58 rtnl_doit_func doit;
59 rtnl_dumpit_func dumpit;
60 };
61
62 static DEFINE_MUTEX(rtnl_mutex);
63
64 void rtnl_lock(void)
65 {
66 mutex_lock(&rtnl_mutex);
67 }
68
69 void __rtnl_unlock(void)
70 {
71 mutex_unlock(&rtnl_mutex);
72 }
73
74 void rtnl_unlock(void)
75 {
76 mutex_unlock(&rtnl_mutex);
77 netdev_run_todo();
78 }
79
80 int rtnl_trylock(void)
81 {
82 return mutex_trylock(&rtnl_mutex);
83 }
84
85 int rtnl_is_locked(void)
86 {
87 return mutex_is_locked(&rtnl_mutex);
88 }
89
90 static struct rtnl_link *rtnl_msg_handlers[NPROTO];
91
92 static inline int rtm_msgindex(int msgtype)
93 {
94 int msgindex = msgtype - RTM_BASE;
95
96 /*
97 * msgindex < 0 implies someone tried to register a netlink
98 * control code. msgindex >= RTM_NR_MSGTYPES may indicate that
99 * the message type has not been added to linux/rtnetlink.h
100 */
101 BUG_ON(msgindex < 0 || msgindex >= RTM_NR_MSGTYPES);
102
103 return msgindex;
104 }
105
106 static rtnl_doit_func rtnl_get_doit(int protocol, int msgindex)
107 {
108 struct rtnl_link *tab;
109
110 tab = rtnl_msg_handlers[protocol];
111 if (tab == NULL || tab[msgindex].doit == NULL)
112 tab = rtnl_msg_handlers[PF_UNSPEC];
113
114 return tab ? tab[msgindex].doit : NULL;
115 }
116
117 static rtnl_dumpit_func rtnl_get_dumpit(int protocol, int msgindex)
118 {
119 struct rtnl_link *tab;
120
121 tab = rtnl_msg_handlers[protocol];
122 if (tab == NULL || tab[msgindex].dumpit == NULL)
123 tab = rtnl_msg_handlers[PF_UNSPEC];
124
125 return tab ? tab[msgindex].dumpit : NULL;
126 }
127
128 /**
129 * __rtnl_register - Register a rtnetlink message type
130 * @protocol: Protocol family or PF_UNSPEC
131 * @msgtype: rtnetlink message type
132 * @doit: Function pointer called for each request message
133 * @dumpit: Function pointer called for each dump request (NLM_F_DUMP) message
134 *
135 * Registers the specified function pointers (at least one of them has
136 * to be non-NULL) to be called whenever a request message for the
137 * specified protocol family and message type is received.
138 *
139 * The special protocol family PF_UNSPEC may be used to define fallback
140 * function pointers for the case when no entry for the specific protocol
141 * family exists.
142 *
143 * Returns 0 on success or a negative error code.
144 */
145 int __rtnl_register(int protocol, int msgtype,
146 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
147 {
148 struct rtnl_link *tab;
149 int msgindex;
150
151 BUG_ON(protocol < 0 || protocol >= NPROTO);
152 msgindex = rtm_msgindex(msgtype);
153
154 tab = rtnl_msg_handlers[protocol];
155 if (tab == NULL) {
156 tab = kcalloc(RTM_NR_MSGTYPES, sizeof(*tab), GFP_KERNEL);
157 if (tab == NULL)
158 return -ENOBUFS;
159
160 rtnl_msg_handlers[protocol] = tab;
161 }
162
163 if (doit)
164 tab[msgindex].doit = doit;
165
166 if (dumpit)
167 tab[msgindex].dumpit = dumpit;
168
169 return 0;
170 }
171
172 EXPORT_SYMBOL_GPL(__rtnl_register);
173
174 /**
175 * rtnl_register - Register a rtnetlink message type
176 *
177 * Identical to __rtnl_register() but panics on failure. This is useful
178 * as failure of this function is very unlikely, it can only happen due
179 * to lack of memory when allocating the chain to store all message
180 * handlers for a protocol. Meant for use in init functions where lack
181 * of memory implies no sense in continueing.
182 */
183 void rtnl_register(int protocol, int msgtype,
184 rtnl_doit_func doit, rtnl_dumpit_func dumpit)
185 {
186 if (__rtnl_register(protocol, msgtype, doit, dumpit) < 0)
187 panic("Unable to register rtnetlink message handler, "
188 "protocol = %d, message type = %d\n",
189 protocol, msgtype);
190 }
191
192 EXPORT_SYMBOL_GPL(rtnl_register);
193
194 /**
195 * rtnl_unregister - Unregister a rtnetlink message type
196 * @protocol: Protocol family or PF_UNSPEC
197 * @msgtype: rtnetlink message type
198 *
199 * Returns 0 on success or a negative error code.
200 */
201 int rtnl_unregister(int protocol, int msgtype)
202 {
203 int msgindex;
204
205 BUG_ON(protocol < 0 || protocol >= NPROTO);
206 msgindex = rtm_msgindex(msgtype);
207
208 if (rtnl_msg_handlers[protocol] == NULL)
209 return -ENOENT;
210
211 rtnl_msg_handlers[protocol][msgindex].doit = NULL;
212 rtnl_msg_handlers[protocol][msgindex].dumpit = NULL;
213
214 return 0;
215 }
216
217 EXPORT_SYMBOL_GPL(rtnl_unregister);
218
219 /**
220 * rtnl_unregister_all - Unregister all rtnetlink message type of a protocol
221 * @protocol : Protocol family or PF_UNSPEC
222 *
223 * Identical to calling rtnl_unregster() for all registered message types
224 * of a certain protocol family.
225 */
226 void rtnl_unregister_all(int protocol)
227 {
228 BUG_ON(protocol < 0 || protocol >= NPROTO);
229
230 kfree(rtnl_msg_handlers[protocol]);
231 rtnl_msg_handlers[protocol] = NULL;
232 }
233
234 EXPORT_SYMBOL_GPL(rtnl_unregister_all);
235
236 static LIST_HEAD(link_ops);
237
238 /**
239 * __rtnl_link_register - Register rtnl_link_ops with rtnetlink.
240 * @ops: struct rtnl_link_ops * to register
241 *
242 * The caller must hold the rtnl_mutex. This function should be used
243 * by drivers that create devices during module initialization. It
244 * must be called before registering the devices.
245 *
246 * Returns 0 on success or a negative error code.
247 */
248 int __rtnl_link_register(struct rtnl_link_ops *ops)
249 {
250 if (!ops->dellink)
251 ops->dellink = unregister_netdevice;
252
253 list_add_tail(&ops->list, &link_ops);
254 return 0;
255 }
256
257 EXPORT_SYMBOL_GPL(__rtnl_link_register);
258
259 /**
260 * rtnl_link_register - Register rtnl_link_ops with rtnetlink.
261 * @ops: struct rtnl_link_ops * to register
262 *
263 * Returns 0 on success or a negative error code.
264 */
265 int rtnl_link_register(struct rtnl_link_ops *ops)
266 {
267 int err;
268
269 rtnl_lock();
270 err = __rtnl_link_register(ops);
271 rtnl_unlock();
272 return err;
273 }
274
275 EXPORT_SYMBOL_GPL(rtnl_link_register);
276
277 static void __rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
278 {
279 struct net_device *dev;
280 restart:
281 for_each_netdev(net, dev) {
282 if (dev->rtnl_link_ops == ops) {
283 ops->dellink(dev);
284 goto restart;
285 }
286 }
287 }
288
289 void rtnl_kill_links(struct net *net, struct rtnl_link_ops *ops)
290 {
291 rtnl_lock();
292 __rtnl_kill_links(net, ops);
293 rtnl_unlock();
294 }
295 EXPORT_SYMBOL_GPL(rtnl_kill_links);
296
297 /**
298 * __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
299 * @ops: struct rtnl_link_ops * to unregister
300 *
301 * The caller must hold the rtnl_mutex.
302 */
303 void __rtnl_link_unregister(struct rtnl_link_ops *ops)
304 {
305 struct net *net;
306
307 for_each_net(net) {
308 __rtnl_kill_links(net, ops);
309 }
310 list_del(&ops->list);
311 }
312
313 EXPORT_SYMBOL_GPL(__rtnl_link_unregister);
314
315 /**
316 * rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
317 * @ops: struct rtnl_link_ops * to unregister
318 */
319 void rtnl_link_unregister(struct rtnl_link_ops *ops)
320 {
321 rtnl_lock();
322 __rtnl_link_unregister(ops);
323 rtnl_unlock();
324 }
325
326 EXPORT_SYMBOL_GPL(rtnl_link_unregister);
327
328 static const struct rtnl_link_ops *rtnl_link_ops_get(const char *kind)
329 {
330 const struct rtnl_link_ops *ops;
331
332 list_for_each_entry(ops, &link_ops, list) {
333 if (!strcmp(ops->kind, kind))
334 return ops;
335 }
336 return NULL;
337 }
338
339 static size_t rtnl_link_get_size(const struct net_device *dev)
340 {
341 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
342 size_t size;
343
344 if (!ops)
345 return 0;
346
347 size = nlmsg_total_size(sizeof(struct nlattr)) + /* IFLA_LINKINFO */
348 nlmsg_total_size(strlen(ops->kind) + 1); /* IFLA_INFO_KIND */
349
350 if (ops->get_size)
351 /* IFLA_INFO_DATA + nested data */
352 size += nlmsg_total_size(sizeof(struct nlattr)) +
353 ops->get_size(dev);
354
355 if (ops->get_xstats_size)
356 size += ops->get_xstats_size(dev); /* IFLA_INFO_XSTATS */
357
358 return size;
359 }
360
361 static int rtnl_link_fill(struct sk_buff *skb, const struct net_device *dev)
362 {
363 const struct rtnl_link_ops *ops = dev->rtnl_link_ops;
364 struct nlattr *linkinfo, *data;
365 int err = -EMSGSIZE;
366
367 linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
368 if (linkinfo == NULL)
369 goto out;
370
371 if (nla_put_string(skb, IFLA_INFO_KIND, ops->kind) < 0)
372 goto err_cancel_link;
373 if (ops->fill_xstats) {
374 err = ops->fill_xstats(skb, dev);
375 if (err < 0)
376 goto err_cancel_link;
377 }
378 if (ops->fill_info) {
379 data = nla_nest_start(skb, IFLA_INFO_DATA);
380 if (data == NULL)
381 goto err_cancel_link;
382 err = ops->fill_info(skb, dev);
383 if (err < 0)
384 goto err_cancel_data;
385 nla_nest_end(skb, data);
386 }
387
388 nla_nest_end(skb, linkinfo);
389 return 0;
390
391 err_cancel_data:
392 nla_nest_cancel(skb, data);
393 err_cancel_link:
394 nla_nest_cancel(skb, linkinfo);
395 out:
396 return err;
397 }
398
399 static const int rtm_min[RTM_NR_FAMILIES] =
400 {
401 [RTM_FAM(RTM_NEWLINK)] = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
402 [RTM_FAM(RTM_NEWADDR)] = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
403 [RTM_FAM(RTM_NEWROUTE)] = NLMSG_LENGTH(sizeof(struct rtmsg)),
404 [RTM_FAM(RTM_NEWRULE)] = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
405 [RTM_FAM(RTM_NEWQDISC)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
406 [RTM_FAM(RTM_NEWTCLASS)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
407 [RTM_FAM(RTM_NEWTFILTER)] = NLMSG_LENGTH(sizeof(struct tcmsg)),
408 [RTM_FAM(RTM_NEWACTION)] = NLMSG_LENGTH(sizeof(struct tcamsg)),
409 [RTM_FAM(RTM_GETMULTICAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
410 [RTM_FAM(RTM_GETANYCAST)] = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
411 };
412
413 static const int rta_max[RTM_NR_FAMILIES] =
414 {
415 [RTM_FAM(RTM_NEWLINK)] = IFLA_MAX,
416 [RTM_FAM(RTM_NEWADDR)] = IFA_MAX,
417 [RTM_FAM(RTM_NEWROUTE)] = RTA_MAX,
418 [RTM_FAM(RTM_NEWRULE)] = FRA_MAX,
419 [RTM_FAM(RTM_NEWQDISC)] = TCA_MAX,
420 [RTM_FAM(RTM_NEWTCLASS)] = TCA_MAX,
421 [RTM_FAM(RTM_NEWTFILTER)] = TCA_MAX,
422 [RTM_FAM(RTM_NEWACTION)] = TCAA_MAX,
423 };
424
425 void __rta_fill(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
426 {
427 struct rtattr *rta;
428 int size = RTA_LENGTH(attrlen);
429
430 rta = (struct rtattr*)skb_put(skb, RTA_ALIGN(size));
431 rta->rta_type = attrtype;
432 rta->rta_len = size;
433 memcpy(RTA_DATA(rta), data, attrlen);
434 memset(RTA_DATA(rta) + attrlen, 0, RTA_ALIGN(size) - size);
435 }
436
437 int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned group, int echo)
438 {
439 struct sock *rtnl = net->rtnl;
440 int err = 0;
441
442 NETLINK_CB(skb).dst_group = group;
443 if (echo)
444 atomic_inc(&skb->users);
445 netlink_broadcast(rtnl, skb, pid, group, GFP_KERNEL);
446 if (echo)
447 err = netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
448 return err;
449 }
450
451 int rtnl_unicast(struct sk_buff *skb, struct net *net, u32 pid)
452 {
453 struct sock *rtnl = net->rtnl;
454
455 return nlmsg_unicast(rtnl, skb, pid);
456 }
457
458 int rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
459 struct nlmsghdr *nlh, gfp_t flags)
460 {
461 struct sock *rtnl = net->rtnl;
462 int report = 0;
463
464 if (nlh)
465 report = nlmsg_report(nlh);
466
467 return nlmsg_notify(rtnl, skb, pid, group, report, flags);
468 }
469
470 void rtnl_set_sk_err(struct net *net, u32 group, int error)
471 {
472 struct sock *rtnl = net->rtnl;
473
474 netlink_set_err(rtnl, 0, group, error);
475 }
476
477 int rtnetlink_put_metrics(struct sk_buff *skb, u32 *metrics)
478 {
479 struct nlattr *mx;
480 int i, valid = 0;
481
482 mx = nla_nest_start(skb, RTA_METRICS);
483 if (mx == NULL)
484 return -ENOBUFS;
485
486 for (i = 0; i < RTAX_MAX; i++) {
487 if (metrics[i]) {
488 valid++;
489 NLA_PUT_U32(skb, i+1, metrics[i]);
490 }
491 }
492
493 if (!valid) {
494 nla_nest_cancel(skb, mx);
495 return 0;
496 }
497
498 return nla_nest_end(skb, mx);
499
500 nla_put_failure:
501 nla_nest_cancel(skb, mx);
502 return -EMSGSIZE;
503 }
504
505 int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
506 u32 ts, u32 tsage, long expires, u32 error)
507 {
508 struct rta_cacheinfo ci = {
509 .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
510 .rta_used = dst->__use,
511 .rta_clntref = atomic_read(&(dst->__refcnt)),
512 .rta_error = error,
513 .rta_id = id,
514 .rta_ts = ts,
515 .rta_tsage = tsage,
516 };
517
518 if (expires)
519 ci.rta_expires = jiffies_to_clock_t(expires);
520
521 return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
522 }
523
524 EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
525
526 static void set_operstate(struct net_device *dev, unsigned char transition)
527 {
528 unsigned char operstate = dev->operstate;
529
530 switch(transition) {
531 case IF_OPER_UP:
532 if ((operstate == IF_OPER_DORMANT ||
533 operstate == IF_OPER_UNKNOWN) &&
534 !netif_dormant(dev))
535 operstate = IF_OPER_UP;
536 break;
537
538 case IF_OPER_DORMANT:
539 if (operstate == IF_OPER_UP ||
540 operstate == IF_OPER_UNKNOWN)
541 operstate = IF_OPER_DORMANT;
542 break;
543 }
544
545 if (dev->operstate != operstate) {
546 write_lock_bh(&dev_base_lock);
547 dev->operstate = operstate;
548 write_unlock_bh(&dev_base_lock);
549 netdev_state_change(dev);
550 }
551 }
552
553 static void copy_rtnl_link_stats(struct rtnl_link_stats *a,
554 struct net_device_stats *b)
555 {
556 a->rx_packets = b->rx_packets;
557 a->tx_packets = b->tx_packets;
558 a->rx_bytes = b->rx_bytes;
559 a->tx_bytes = b->tx_bytes;
560 a->rx_errors = b->rx_errors;
561 a->tx_errors = b->tx_errors;
562 a->rx_dropped = b->rx_dropped;
563 a->tx_dropped = b->tx_dropped;
564
565 a->multicast = b->multicast;
566 a->collisions = b->collisions;
567
568 a->rx_length_errors = b->rx_length_errors;
569 a->rx_over_errors = b->rx_over_errors;
570 a->rx_crc_errors = b->rx_crc_errors;
571 a->rx_frame_errors = b->rx_frame_errors;
572 a->rx_fifo_errors = b->rx_fifo_errors;
573 a->rx_missed_errors = b->rx_missed_errors;
574
575 a->tx_aborted_errors = b->tx_aborted_errors;
576 a->tx_carrier_errors = b->tx_carrier_errors;
577 a->tx_fifo_errors = b->tx_fifo_errors;
578 a->tx_heartbeat_errors = b->tx_heartbeat_errors;
579 a->tx_window_errors = b->tx_window_errors;
580
581 a->rx_compressed = b->rx_compressed;
582 a->tx_compressed = b->tx_compressed;
583 };
584
585 static inline size_t if_nlmsg_size(const struct net_device *dev)
586 {
587 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
588 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
589 + nla_total_size(IFNAMSIZ) /* IFLA_QDISC */
590 + nla_total_size(sizeof(struct rtnl_link_ifmap))
591 + nla_total_size(sizeof(struct rtnl_link_stats))
592 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
593 + nla_total_size(MAX_ADDR_LEN) /* IFLA_BROADCAST */
594 + nla_total_size(4) /* IFLA_TXQLEN */
595 + nla_total_size(4) /* IFLA_WEIGHT */
596 + nla_total_size(4) /* IFLA_MTU */
597 + nla_total_size(4) /* IFLA_LINK */
598 + nla_total_size(4) /* IFLA_MASTER */
599 + nla_total_size(1) /* IFLA_OPERSTATE */
600 + nla_total_size(1) /* IFLA_LINKMODE */
601 + rtnl_link_get_size(dev); /* IFLA_LINKINFO */
602 }
603
604 static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
605 int type, u32 pid, u32 seq, u32 change,
606 unsigned int flags)
607 {
608 struct ifinfomsg *ifm;
609 struct nlmsghdr *nlh;
610
611 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
612 if (nlh == NULL)
613 return -EMSGSIZE;
614
615 ifm = nlmsg_data(nlh);
616 ifm->ifi_family = AF_UNSPEC;
617 ifm->__ifi_pad = 0;
618 ifm->ifi_type = dev->type;
619 ifm->ifi_index = dev->ifindex;
620 ifm->ifi_flags = dev_get_flags(dev);
621 ifm->ifi_change = change;
622
623 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
624 NLA_PUT_U32(skb, IFLA_TXQLEN, dev->tx_queue_len);
625 NLA_PUT_U8(skb, IFLA_OPERSTATE,
626 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
627 NLA_PUT_U8(skb, IFLA_LINKMODE, dev->link_mode);
628 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
629
630 if (dev->ifindex != dev->iflink)
631 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
632
633 if (dev->master)
634 NLA_PUT_U32(skb, IFLA_MASTER, dev->master->ifindex);
635
636 if (dev->qdisc_sleeping)
637 NLA_PUT_STRING(skb, IFLA_QDISC, dev->qdisc_sleeping->ops->id);
638
639 if (1) {
640 struct rtnl_link_ifmap map = {
641 .mem_start = dev->mem_start,
642 .mem_end = dev->mem_end,
643 .base_addr = dev->base_addr,
644 .irq = dev->irq,
645 .dma = dev->dma,
646 .port = dev->if_port,
647 };
648 NLA_PUT(skb, IFLA_MAP, sizeof(map), &map);
649 }
650
651 if (dev->addr_len) {
652 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
653 NLA_PUT(skb, IFLA_BROADCAST, dev->addr_len, dev->broadcast);
654 }
655
656 if (dev->get_stats) {
657 struct net_device_stats *stats = dev->get_stats(dev);
658 if (stats) {
659 struct nlattr *attr;
660
661 attr = nla_reserve(skb, IFLA_STATS,
662 sizeof(struct rtnl_link_stats));
663 if (attr == NULL)
664 goto nla_put_failure;
665
666 copy_rtnl_link_stats(nla_data(attr), stats);
667 }
668 }
669
670 if (dev->rtnl_link_ops) {
671 if (rtnl_link_fill(skb, dev) < 0)
672 goto nla_put_failure;
673 }
674
675 return nlmsg_end(skb, nlh);
676
677 nla_put_failure:
678 nlmsg_cancel(skb, nlh);
679 return -EMSGSIZE;
680 }
681
682 static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
683 {
684 struct net *net = sock_net(skb->sk);
685 int idx;
686 int s_idx = cb->args[0];
687 struct net_device *dev;
688
689 idx = 0;
690 for_each_netdev(net, dev) {
691 if (idx < s_idx)
692 goto cont;
693 if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
694 NETLINK_CB(cb->skb).pid,
695 cb->nlh->nlmsg_seq, 0, NLM_F_MULTI) <= 0)
696 break;
697 cont:
698 idx++;
699 }
700 cb->args[0] = idx;
701
702 return skb->len;
703 }
704
705 const struct nla_policy ifla_policy[IFLA_MAX+1] = {
706 [IFLA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ-1 },
707 [IFLA_ADDRESS] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
708 [IFLA_BROADCAST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
709 [IFLA_MAP] = { .len = sizeof(struct rtnl_link_ifmap) },
710 [IFLA_MTU] = { .type = NLA_U32 },
711 [IFLA_LINK] = { .type = NLA_U32 },
712 [IFLA_TXQLEN] = { .type = NLA_U32 },
713 [IFLA_WEIGHT] = { .type = NLA_U32 },
714 [IFLA_OPERSTATE] = { .type = NLA_U8 },
715 [IFLA_LINKMODE] = { .type = NLA_U8 },
716 [IFLA_LINKINFO] = { .type = NLA_NESTED },
717 [IFLA_NET_NS_PID] = { .type = NLA_U32 },
718 };
719
720 static const struct nla_policy ifla_info_policy[IFLA_INFO_MAX+1] = {
721 [IFLA_INFO_KIND] = { .type = NLA_STRING },
722 [IFLA_INFO_DATA] = { .type = NLA_NESTED },
723 };
724
725 static struct net *get_net_ns_by_pid(pid_t pid)
726 {
727 struct task_struct *tsk;
728 struct net *net;
729
730 /* Lookup the network namespace */
731 net = ERR_PTR(-ESRCH);
732 rcu_read_lock();
733 tsk = find_task_by_vpid(pid);
734 if (tsk) {
735 struct nsproxy *nsproxy;
736 nsproxy = task_nsproxy(tsk);
737 if (nsproxy)
738 net = get_net(nsproxy->net_ns);
739 }
740 rcu_read_unlock();
741 return net;
742 }
743
744 static int validate_linkmsg(struct net_device *dev, struct nlattr *tb[])
745 {
746 if (dev) {
747 if (tb[IFLA_ADDRESS] &&
748 nla_len(tb[IFLA_ADDRESS]) < dev->addr_len)
749 return -EINVAL;
750
751 if (tb[IFLA_BROADCAST] &&
752 nla_len(tb[IFLA_BROADCAST]) < dev->addr_len)
753 return -EINVAL;
754 }
755
756 return 0;
757 }
758
759 static int do_setlink(struct net_device *dev, struct ifinfomsg *ifm,
760 struct nlattr **tb, char *ifname, int modified)
761 {
762 int send_addr_notify = 0;
763 int err;
764
765 if (tb[IFLA_NET_NS_PID]) {
766 struct net *net;
767 net = get_net_ns_by_pid(nla_get_u32(tb[IFLA_NET_NS_PID]));
768 if (IS_ERR(net)) {
769 err = PTR_ERR(net);
770 goto errout;
771 }
772 err = dev_change_net_namespace(dev, net, ifname);
773 put_net(net);
774 if (err)
775 goto errout;
776 modified = 1;
777 }
778
779 if (tb[IFLA_MAP]) {
780 struct rtnl_link_ifmap *u_map;
781 struct ifmap k_map;
782
783 if (!dev->set_config) {
784 err = -EOPNOTSUPP;
785 goto errout;
786 }
787
788 if (!netif_device_present(dev)) {
789 err = -ENODEV;
790 goto errout;
791 }
792
793 u_map = nla_data(tb[IFLA_MAP]);
794 k_map.mem_start = (unsigned long) u_map->mem_start;
795 k_map.mem_end = (unsigned long) u_map->mem_end;
796 k_map.base_addr = (unsigned short) u_map->base_addr;
797 k_map.irq = (unsigned char) u_map->irq;
798 k_map.dma = (unsigned char) u_map->dma;
799 k_map.port = (unsigned char) u_map->port;
800
801 err = dev->set_config(dev, &k_map);
802 if (err < 0)
803 goto errout;
804
805 modified = 1;
806 }
807
808 if (tb[IFLA_ADDRESS]) {
809 struct sockaddr *sa;
810 int len;
811
812 if (!dev->set_mac_address) {
813 err = -EOPNOTSUPP;
814 goto errout;
815 }
816
817 if (!netif_device_present(dev)) {
818 err = -ENODEV;
819 goto errout;
820 }
821
822 len = sizeof(sa_family_t) + dev->addr_len;
823 sa = kmalloc(len, GFP_KERNEL);
824 if (!sa) {
825 err = -ENOMEM;
826 goto errout;
827 }
828 sa->sa_family = dev->type;
829 memcpy(sa->sa_data, nla_data(tb[IFLA_ADDRESS]),
830 dev->addr_len);
831 err = dev->set_mac_address(dev, sa);
832 kfree(sa);
833 if (err)
834 goto errout;
835 send_addr_notify = 1;
836 modified = 1;
837 }
838
839 if (tb[IFLA_MTU]) {
840 err = dev_set_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
841 if (err < 0)
842 goto errout;
843 modified = 1;
844 }
845
846 /*
847 * Interface selected by interface index but interface
848 * name provided implies that a name change has been
849 * requested.
850 */
851 if (ifm->ifi_index > 0 && ifname[0]) {
852 err = dev_change_name(dev, ifname);
853 if (err < 0)
854 goto errout;
855 modified = 1;
856 }
857
858 if (tb[IFLA_BROADCAST]) {
859 nla_memcpy(dev->broadcast, tb[IFLA_BROADCAST], dev->addr_len);
860 send_addr_notify = 1;
861 }
862
863 if (ifm->ifi_flags || ifm->ifi_change) {
864 unsigned int flags = ifm->ifi_flags;
865
866 /* bugwards compatibility: ifi_change == 0 is treated as ~0 */
867 if (ifm->ifi_change)
868 flags = (flags & ifm->ifi_change) |
869 (dev->flags & ~ifm->ifi_change);
870 dev_change_flags(dev, flags);
871 }
872
873 if (tb[IFLA_TXQLEN])
874 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
875
876 if (tb[IFLA_OPERSTATE])
877 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
878
879 if (tb[IFLA_LINKMODE]) {
880 write_lock_bh(&dev_base_lock);
881 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
882 write_unlock_bh(&dev_base_lock);
883 }
884
885 err = 0;
886
887 errout:
888 if (err < 0 && modified && net_ratelimit())
889 printk(KERN_WARNING "A link change request failed with "
890 "some changes comitted already. Interface %s may "
891 "have been left with an inconsistent configuration, "
892 "please check.\n", dev->name);
893
894 if (send_addr_notify)
895 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
896 return err;
897 }
898
899 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
900 {
901 struct net *net = sock_net(skb->sk);
902 struct ifinfomsg *ifm;
903 struct net_device *dev;
904 int err;
905 struct nlattr *tb[IFLA_MAX+1];
906 char ifname[IFNAMSIZ];
907
908 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
909 if (err < 0)
910 goto errout;
911
912 if (tb[IFLA_IFNAME])
913 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
914 else
915 ifname[0] = '\0';
916
917 err = -EINVAL;
918 ifm = nlmsg_data(nlh);
919 if (ifm->ifi_index > 0)
920 dev = dev_get_by_index(net, ifm->ifi_index);
921 else if (tb[IFLA_IFNAME])
922 dev = dev_get_by_name(net, ifname);
923 else
924 goto errout;
925
926 if (dev == NULL) {
927 err = -ENODEV;
928 goto errout;
929 }
930
931 if ((err = validate_linkmsg(dev, tb)) < 0)
932 goto errout_dev;
933
934 err = do_setlink(dev, ifm, tb, ifname, 0);
935 errout_dev:
936 dev_put(dev);
937 errout:
938 return err;
939 }
940
941 static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
942 {
943 struct net *net = sock_net(skb->sk);
944 const struct rtnl_link_ops *ops;
945 struct net_device *dev;
946 struct ifinfomsg *ifm;
947 char ifname[IFNAMSIZ];
948 struct nlattr *tb[IFLA_MAX+1];
949 int err;
950
951 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
952 if (err < 0)
953 return err;
954
955 if (tb[IFLA_IFNAME])
956 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
957
958 ifm = nlmsg_data(nlh);
959 if (ifm->ifi_index > 0)
960 dev = __dev_get_by_index(net, ifm->ifi_index);
961 else if (tb[IFLA_IFNAME])
962 dev = __dev_get_by_name(net, ifname);
963 else
964 return -EINVAL;
965
966 if (!dev)
967 return -ENODEV;
968
969 ops = dev->rtnl_link_ops;
970 if (!ops)
971 return -EOPNOTSUPP;
972
973 ops->dellink(dev);
974 return 0;
975 }
976
977 struct net_device *rtnl_create_link(struct net *net, char *ifname,
978 const struct rtnl_link_ops *ops, struct nlattr *tb[])
979 {
980 int err;
981 struct net_device *dev;
982
983 err = -ENOMEM;
984 dev = alloc_netdev(ops->priv_size, ifname, ops->setup);
985 if (!dev)
986 goto err;
987
988 if (strchr(dev->name, '%')) {
989 err = dev_alloc_name(dev, dev->name);
990 if (err < 0)
991 goto err_free;
992 }
993
994 dev_net_set(dev, net);
995 dev->rtnl_link_ops = ops;
996
997 if (tb[IFLA_MTU])
998 dev->mtu = nla_get_u32(tb[IFLA_MTU]);
999 if (tb[IFLA_ADDRESS])
1000 memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
1001 nla_len(tb[IFLA_ADDRESS]));
1002 if (tb[IFLA_BROADCAST])
1003 memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
1004 nla_len(tb[IFLA_BROADCAST]));
1005 if (tb[IFLA_TXQLEN])
1006 dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
1007 if (tb[IFLA_OPERSTATE])
1008 set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
1009 if (tb[IFLA_LINKMODE])
1010 dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
1011
1012 return dev;
1013
1014 err_free:
1015 free_netdev(dev);
1016 err:
1017 return ERR_PTR(err);
1018 }
1019
1020 static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
1021 {
1022 struct net *net = sock_net(skb->sk);
1023 const struct rtnl_link_ops *ops;
1024 struct net_device *dev;
1025 struct ifinfomsg *ifm;
1026 char kind[MODULE_NAME_LEN];
1027 char ifname[IFNAMSIZ];
1028 struct nlattr *tb[IFLA_MAX+1];
1029 struct nlattr *linkinfo[IFLA_INFO_MAX+1];
1030 int err;
1031
1032 #ifdef CONFIG_KMOD
1033 replay:
1034 #endif
1035 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1036 if (err < 0)
1037 return err;
1038
1039 if (tb[IFLA_IFNAME])
1040 nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
1041 else
1042 ifname[0] = '\0';
1043
1044 ifm = nlmsg_data(nlh);
1045 if (ifm->ifi_index > 0)
1046 dev = __dev_get_by_index(net, ifm->ifi_index);
1047 else if (ifname[0])
1048 dev = __dev_get_by_name(net, ifname);
1049 else
1050 dev = NULL;
1051
1052 if ((err = validate_linkmsg(dev, tb)) < 0)
1053 return err;
1054
1055 if (tb[IFLA_LINKINFO]) {
1056 err = nla_parse_nested(linkinfo, IFLA_INFO_MAX,
1057 tb[IFLA_LINKINFO], ifla_info_policy);
1058 if (err < 0)
1059 return err;
1060 } else
1061 memset(linkinfo, 0, sizeof(linkinfo));
1062
1063 if (linkinfo[IFLA_INFO_KIND]) {
1064 nla_strlcpy(kind, linkinfo[IFLA_INFO_KIND], sizeof(kind));
1065 ops = rtnl_link_ops_get(kind);
1066 } else {
1067 kind[0] = '\0';
1068 ops = NULL;
1069 }
1070
1071 if (1) {
1072 struct nlattr *attr[ops ? ops->maxtype + 1 : 0], **data = NULL;
1073
1074 if (ops) {
1075 if (ops->maxtype && linkinfo[IFLA_INFO_DATA]) {
1076 err = nla_parse_nested(attr, ops->maxtype,
1077 linkinfo[IFLA_INFO_DATA],
1078 ops->policy);
1079 if (err < 0)
1080 return err;
1081 data = attr;
1082 }
1083 if (ops->validate) {
1084 err = ops->validate(tb, data);
1085 if (err < 0)
1086 return err;
1087 }
1088 }
1089
1090 if (dev) {
1091 int modified = 0;
1092
1093 if (nlh->nlmsg_flags & NLM_F_EXCL)
1094 return -EEXIST;
1095 if (nlh->nlmsg_flags & NLM_F_REPLACE)
1096 return -EOPNOTSUPP;
1097
1098 if (linkinfo[IFLA_INFO_DATA]) {
1099 if (!ops || ops != dev->rtnl_link_ops ||
1100 !ops->changelink)
1101 return -EOPNOTSUPP;
1102
1103 err = ops->changelink(dev, tb, data);
1104 if (err < 0)
1105 return err;
1106 modified = 1;
1107 }
1108
1109 return do_setlink(dev, ifm, tb, ifname, modified);
1110 }
1111
1112 if (!(nlh->nlmsg_flags & NLM_F_CREATE))
1113 return -ENODEV;
1114
1115 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
1116 return -EOPNOTSUPP;
1117 if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
1118 return -EOPNOTSUPP;
1119
1120 if (!ops) {
1121 #ifdef CONFIG_KMOD
1122 if (kind[0]) {
1123 __rtnl_unlock();
1124 request_module("rtnl-link-%s", kind);
1125 rtnl_lock();
1126 ops = rtnl_link_ops_get(kind);
1127 if (ops)
1128 goto replay;
1129 }
1130 #endif
1131 return -EOPNOTSUPP;
1132 }
1133
1134 if (!ifname[0])
1135 snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
1136
1137 dev = rtnl_create_link(net, ifname, ops, tb);
1138
1139 if (IS_ERR(dev))
1140 err = PTR_ERR(dev);
1141 else if (ops->newlink)
1142 err = ops->newlink(dev, tb, data);
1143 else
1144 err = register_netdevice(dev);
1145
1146 if (err < 0 && !IS_ERR(dev))
1147 free_netdev(dev);
1148 return err;
1149 }
1150 }
1151
1152 static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
1153 {
1154 struct net *net = sock_net(skb->sk);
1155 struct ifinfomsg *ifm;
1156 struct nlattr *tb[IFLA_MAX+1];
1157 struct net_device *dev = NULL;
1158 struct sk_buff *nskb;
1159 int err;
1160
1161 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
1162 if (err < 0)
1163 return err;
1164
1165 ifm = nlmsg_data(nlh);
1166 if (ifm->ifi_index > 0) {
1167 dev = dev_get_by_index(net, ifm->ifi_index);
1168 if (dev == NULL)
1169 return -ENODEV;
1170 } else
1171 return -EINVAL;
1172
1173 nskb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1174 if (nskb == NULL) {
1175 err = -ENOBUFS;
1176 goto errout;
1177 }
1178
1179 err = rtnl_fill_ifinfo(nskb, dev, RTM_NEWLINK, NETLINK_CB(skb).pid,
1180 nlh->nlmsg_seq, 0, 0);
1181 if (err < 0) {
1182 /* -EMSGSIZE implies BUG in if_nlmsg_size */
1183 WARN_ON(err == -EMSGSIZE);
1184 kfree_skb(nskb);
1185 goto errout;
1186 }
1187 err = rtnl_unicast(nskb, net, NETLINK_CB(skb).pid);
1188 errout:
1189 dev_put(dev);
1190
1191 return err;
1192 }
1193
1194 static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
1195 {
1196 int idx;
1197 int s_idx = cb->family;
1198
1199 if (s_idx == 0)
1200 s_idx = 1;
1201 for (idx=1; idx<NPROTO; idx++) {
1202 int type = cb->nlh->nlmsg_type-RTM_BASE;
1203 if (idx < s_idx || idx == PF_PACKET)
1204 continue;
1205 if (rtnl_msg_handlers[idx] == NULL ||
1206 rtnl_msg_handlers[idx][type].dumpit == NULL)
1207 continue;
1208 if (idx > s_idx)
1209 memset(&cb->args[0], 0, sizeof(cb->args));
1210 if (rtnl_msg_handlers[idx][type].dumpit(skb, cb))
1211 break;
1212 }
1213 cb->family = idx;
1214
1215 return skb->len;
1216 }
1217
1218 void rtmsg_ifinfo(int type, struct net_device *dev, unsigned change)
1219 {
1220 struct net *net = dev_net(dev);
1221 struct sk_buff *skb;
1222 int err = -ENOBUFS;
1223
1224 skb = nlmsg_new(if_nlmsg_size(dev), GFP_KERNEL);
1225 if (skb == NULL)
1226 goto errout;
1227
1228 err = rtnl_fill_ifinfo(skb, dev, type, 0, 0, change, 0);
1229 if (err < 0) {
1230 /* -EMSGSIZE implies BUG in if_nlmsg_size() */
1231 WARN_ON(err == -EMSGSIZE);
1232 kfree_skb(skb);
1233 goto errout;
1234 }
1235 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
1236 errout:
1237 if (err < 0)
1238 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
1239 }
1240
1241 /* Protected by RTNL sempahore. */
1242 static struct rtattr **rta_buf;
1243 static int rtattr_max;
1244
1245 /* Process one rtnetlink message. */
1246
1247 static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1248 {
1249 struct net *net = sock_net(skb->sk);
1250 rtnl_doit_func doit;
1251 int sz_idx, kind;
1252 int min_len;
1253 int family;
1254 int type;
1255 int err;
1256
1257 type = nlh->nlmsg_type;
1258 if (type > RTM_MAX)
1259 return -EOPNOTSUPP;
1260
1261 type -= RTM_BASE;
1262
1263 /* All the messages must have at least 1 byte length */
1264 if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(struct rtgenmsg)))
1265 return 0;
1266
1267 family = ((struct rtgenmsg*)NLMSG_DATA(nlh))->rtgen_family;
1268 if (family >= NPROTO)
1269 return -EAFNOSUPPORT;
1270
1271 sz_idx = type>>2;
1272 kind = type&3;
1273
1274 if (kind != 2 && security_netlink_recv(skb, CAP_NET_ADMIN))
1275 return -EPERM;
1276
1277 if (kind == 2 && nlh->nlmsg_flags&NLM_F_DUMP) {
1278 struct sock *rtnl;
1279 rtnl_dumpit_func dumpit;
1280
1281 dumpit = rtnl_get_dumpit(family, type);
1282 if (dumpit == NULL)
1283 return -EOPNOTSUPP;
1284
1285 __rtnl_unlock();
1286 rtnl = net->rtnl;
1287 err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
1288 rtnl_lock();
1289 return err;
1290 }
1291
1292 memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
1293
1294 min_len = rtm_min[sz_idx];
1295 if (nlh->nlmsg_len < min_len)
1296 return -EINVAL;
1297
1298 if (nlh->nlmsg_len > min_len) {
1299 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1300 struct rtattr *attr = (void*)nlh + NLMSG_ALIGN(min_len);
1301
1302 while (RTA_OK(attr, attrlen)) {
1303 unsigned flavor = attr->rta_type;
1304 if (flavor) {
1305 if (flavor > rta_max[sz_idx])
1306 return -EINVAL;
1307 rta_buf[flavor-1] = attr;
1308 }
1309 attr = RTA_NEXT(attr, attrlen);
1310 }
1311 }
1312
1313 doit = rtnl_get_doit(family, type);
1314 if (doit == NULL)
1315 return -EOPNOTSUPP;
1316
1317 return doit(skb, nlh, (void *)&rta_buf[0]);
1318 }
1319
1320 static void rtnetlink_rcv(struct sk_buff *skb)
1321 {
1322 rtnl_lock();
1323 netlink_rcv_skb(skb, &rtnetlink_rcv_msg);
1324 rtnl_unlock();
1325 }
1326
1327 static int rtnetlink_event(struct notifier_block *this, unsigned long event, void *ptr)
1328 {
1329 struct net_device *dev = ptr;
1330
1331 switch (event) {
1332 case NETDEV_UNREGISTER:
1333 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
1334 break;
1335 case NETDEV_REGISTER:
1336 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
1337 break;
1338 case NETDEV_UP:
1339 case NETDEV_DOWN:
1340 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
1341 break;
1342 case NETDEV_CHANGE:
1343 case NETDEV_GOING_DOWN:
1344 break;
1345 default:
1346 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1347 break;
1348 }
1349 return NOTIFY_DONE;
1350 }
1351
1352 static struct notifier_block rtnetlink_dev_notifier = {
1353 .notifier_call = rtnetlink_event,
1354 };
1355
1356
1357 static int rtnetlink_net_init(struct net *net)
1358 {
1359 struct sock *sk;
1360 sk = netlink_kernel_create(net, NETLINK_ROUTE, RTNLGRP_MAX,
1361 rtnetlink_rcv, &rtnl_mutex, THIS_MODULE);
1362 if (!sk)
1363 return -ENOMEM;
1364 net->rtnl = sk;
1365 return 0;
1366 }
1367
1368 static void rtnetlink_net_exit(struct net *net)
1369 {
1370 netlink_kernel_release(net->rtnl);
1371 net->rtnl = NULL;
1372 }
1373
1374 static struct pernet_operations rtnetlink_net_ops = {
1375 .init = rtnetlink_net_init,
1376 .exit = rtnetlink_net_exit,
1377 };
1378
1379 void __init rtnetlink_init(void)
1380 {
1381 int i;
1382
1383 rtattr_max = 0;
1384 for (i = 0; i < ARRAY_SIZE(rta_max); i++)
1385 if (rta_max[i] > rtattr_max)
1386 rtattr_max = rta_max[i];
1387 rta_buf = kmalloc(rtattr_max * sizeof(struct rtattr *), GFP_KERNEL);
1388 if (!rta_buf)
1389 panic("rtnetlink_init: cannot allocate rta_buf\n");
1390
1391 if (register_pernet_subsys(&rtnetlink_net_ops))
1392 panic("rtnetlink_init: cannot initialize rtnetlink\n");
1393
1394 netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);
1395 register_netdevice_notifier(&rtnetlink_dev_notifier);
1396
1397 rtnl_register(PF_UNSPEC, RTM_GETLINK, rtnl_getlink, rtnl_dump_ifinfo);
1398 rtnl_register(PF_UNSPEC, RTM_SETLINK, rtnl_setlink, NULL);
1399 rtnl_register(PF_UNSPEC, RTM_NEWLINK, rtnl_newlink, NULL);
1400 rtnl_register(PF_UNSPEC, RTM_DELLINK, rtnl_dellink, NULL);
1401
1402 rtnl_register(PF_UNSPEC, RTM_GETADDR, NULL, rtnl_dump_all);
1403 rtnl_register(PF_UNSPEC, RTM_GETROUTE, NULL, rtnl_dump_all);
1404 }
1405
1406 EXPORT_SYMBOL(__rta_fill);
1407 EXPORT_SYMBOL(rtnetlink_put_metrics);
1408 EXPORT_SYMBOL(rtnl_lock);
1409 EXPORT_SYMBOL(rtnl_trylock);
1410 EXPORT_SYMBOL(rtnl_unlock);
1411 EXPORT_SYMBOL(rtnl_is_locked);
1412 EXPORT_SYMBOL(rtnl_unicast);
1413 EXPORT_SYMBOL(rtnl_notify);
1414 EXPORT_SYMBOL(rtnl_set_sk_err);
1415 EXPORT_SYMBOL(rtnl_create_link);
1416 EXPORT_SYMBOL(ifla_policy);
Linux 2.6 libata-dev (mirror)